Re: Zero does not equal Zero
- To: mathgroup at smc.vnet.net
- Subject: [mg31412] Re: Zero does not equal Zero
- From: Mark Sofroniou <marks at wolfram.com>
- Date: Sat, 3 Nov 2001 05:29:18 -0500 (EST)
- Organization: Wolfram Research Inc
- References: <9rlt9k$o10$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
You can't use Equal or SameQ for you wants because they have a built in
tolerance that is larger than the difference you are seeking.
However, you can get the closest two bigfloats (1 significant ULP either
side) by simply using Interval.
In[1]:= x=Exp[ N[Pi/3, 20] ];
In[2]:= Interval[x]
Out[2]= Interval[{2.8496539082263614974, 2.8496539082263614975}]
Mark Sofroniou
Wolfram Research